/* muted spring palette: pale new-growth paper, dusty blossom, soft moss */
:root{
  --bg:#F1F3E9;
  --surface:#FCFDF8;
  --surface-2:#E7EBDB;
  --ink:#242A20;
  --muted:#6C7463;
  --line:#D5DBC6;
  --accent:#8F5F6B;
  --accent-ink:#FFFFFF;
  --accent-soft:#F0E3E4;
  --teal:#4F7A5C;
  --teal-soft:#E0EAD8;
  --danger:#9E3A44;
  --shadow:0 1px 2px rgba(36,42,32,.05), 0 12px 32px -18px rgba(36,42,32,.30);
  --radius:14px;
  --maxw:1120px;
}
:root:not([data-theme="light"]) { color-scheme: light; }
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    color-scheme: dark;
    --bg:#15170F;
    --surface:#1E2118;
    --surface-2:#272B20;
    --ink:#E8ECDD;
    --muted:#98A08A;
    --line:#333827;
    --accent:#D9A2AC;
    --accent-ink:#26191D;
    --accent-soft:#3A2A2E;
    --teal:#8FB39A;
    --teal-soft:#22301F;
    --danger:#E79BA3;
    --shadow:0 1px 2px rgba(0,0,0,.4), 0 16px 40px -20px rgba(0,0,0,.8);
  }
}
:root[data-theme="dark"]{
  color-scheme: dark;
  --bg:#15170F;
  --surface:#1E2118;
  --surface-2:#272B20;
  --ink:#E8ECDD;
  --muted:#98A08A;
  --line:#333827;
  --accent:#D9A2AC;
  --accent-ink:#26191D;
  --accent-soft:#3A2A2E;
  --teal:#8FB39A;
  --teal-soft:#22301F;
  --danger:#E79BA3;
  --shadow:0 1px 2px rgba(0,0,0,.4), 0 16px 40px -20px rgba(0,0,0,.8);
}

*{box-sizing:border-box}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:"Public Sans",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;
  font-size:16px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  padding-bottom:0;
}
h1,h2,h3,.display{
  font-family:"Bricolage Grotesque","Public Sans",system-ui,sans-serif;
  font-weight:700;
  line-height:1.08;
  text-wrap:balance;
  margin:0;
  letter-spacing:-.02em;
}
p{margin:0}
button{font:inherit;color:inherit;cursor:pointer}
input,textarea{font:inherit;color:inherit}
a{color:var(--accent)}
:focus-visible{outline:2.5px solid var(--accent);outline-offset:2px;border-radius:6px}

.eyebrow{
  font-size:12px;font-weight:600;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);
}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 22px}

/* ---------- top bar ---------- */
.topbar{
  position:sticky;top:0;z-index:30;
  background:color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.topbar-in{
  max-width:var(--maxw);margin:0 auto;padding:12px 22px;
  display:flex;align-items:center;gap:16px;flex-wrap:wrap;
}
.brand{display:flex;align-items:center;gap:10px;font-family:"Bricolage Grotesque",sans-serif;font-weight:800;font-size:19px;letter-spacing:-.03em}
.brand-mark{
  width:30px;height:30px;border-radius:9px;flex:none;
  background:var(--accent);color:var(--accent-ink);
  display:grid;place-items:center;font-size:15px;font-weight:800;
  transform:rotate(-4deg);
}
.spacer{flex:1}
.langpick{
  display:flex;align-items:center;gap:7px;
  background:var(--surface);border:1px solid var(--line);border-radius:999px;padding:5px 12px 5px 13px;
}
.langpick .globe{font-size:14px;line-height:1}
.langpick select{
  border:0;background:transparent;font-size:14px;font-weight:600;color:var(--ink);
  padding:1px 2px;max-width:170px;cursor:pointer;
}
.langpick select:focus{outline:none}
.langpick:focus-within{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}

/* ---------- buttons ---------- */
.btn{
  border:1px solid transparent;border-radius:10px;padding:11px 18px;
  font-weight:600;font-size:15px;transition:transform .12s ease, background .15s ease;
}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--accent);color:var(--accent-ink)}
.btn-primary:hover{background:color-mix(in srgb, var(--accent) 88%, var(--ink))}
.btn-ghost{background:transparent;border-color:var(--line);color:var(--ink)}
.btn-ghost:hover{background:var(--surface-2)}
.btn-block{width:100%}

/* ---------- forms (signed-in app) ---------- */
.field{display:flex;flex-direction:column;gap:6px;margin-bottom:14px}
.field label{font-size:13px;font-weight:600;color:var(--muted)}
.field input,.field textarea{
  background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:11px 13px;width:100%;
}
.field input:focus,.field textarea:focus{border-color:var(--accent);outline:none;box-shadow:0 0 0 3px var(--accent-soft)}
.field input.code-input{font-size:22px;letter-spacing:.42em;text-align:center;font-variant-numeric:tabular-nums}
.linklike{background:none;border:0;padding:0;margin:0;font:inherit;color:var(--accent);text-decoration:underline;cursor:pointer}
.hint{font-size:13px;color:var(--muted);margin-top:12px;text-align:center}
.msg{font-size:14px;border-radius:10px;padding:9px 12px;margin-bottom:14px;display:none}
.msg.error{display:block;background:var(--accent-soft);color:var(--danger);border:1px solid color-mix(in srgb,var(--danger) 30%, transparent)}
.msg.ok{display:block;background:var(--teal-soft);color:var(--teal)}

/* ---------- home ---------- */
.section{padding:44px 0;border-top:1px solid var(--line)}
.section:first-of-type{border-top:0}
.section h2{font-size:clamp(26px,3.4vw,36px);margin-bottom:8px}
.section .sub{color:var(--muted);max-width:60ch;margin-bottom:26px}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px}
.card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:20px;display:flex;flex-direction:column;gap:8px;
}
.card h3{font-size:19px}
.card p{color:var(--muted);font-size:15px}
.card .meta{margin-top:auto;padding-top:12px;font-size:13px;color:var(--muted);display:flex;justify-content:space-between;gap:10px;border-top:1px dashed var(--line)}
.pill{display:inline-block;background:var(--teal-soft);color:var(--teal);border-radius:999px;padding:3px 10px;font-size:12px;font-weight:600;align-self:flex-start}
.folders{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px}
.folder{
  text-align:left;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:22px 20px;display:flex;flex-direction:column;gap:6px;transition:transform .12s ease, border-color .15s ease, box-shadow .15s ease;
}
.folder:hover{transform:translateY(-2px);border-color:var(--accent);box-shadow:var(--shadow)}
.folder-ic{font-size:38px;line-height:1}
.folder-name{font-family:"Bricolage Grotesque",sans-serif;font-size:21px;font-weight:700;letter-spacing:-.02em;margin-top:4px}
.folder-open{font-size:13px;color:var(--accent);font-weight:600}
.folder-ic-lg{font-size:44px;line-height:1}
.back-btn{margin:28px 0 22px;padding:8px 14px;font-size:14px}
.folder-page-head{display:flex;align-items:center;gap:16px;margin-bottom:4px}
.folder-page-head h1{font-size:clamp(30px,4vw,44px)}
.folder-soon{margin-top:22px;padding:40px 22px;border:1px dashed var(--line);border-radius:var(--radius);color:var(--muted);text-align:center;font-size:16px}
/* section list, lesson list and exercise cards */
.sec-card{cursor:pointer;text-align:left;font:inherit;color:inherit}
.sec-card .n{
  width:34px;height:34px;border-radius:11px;background:var(--accent-soft);color:var(--accent);
  display:grid;place-items:center;font-weight:800;font-size:15px;font-variant-numeric:tabular-nums;
}
.lesson-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:10px;counter-reset:ls}
.lesson-row{
  display:flex;align-items:center;gap:14px;width:100%;text-align:left;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:15px 18px;cursor:pointer;font:inherit;color:inherit;
  transition:transform .12s ease,border-color .15s ease,box-shadow .15s ease;
}
.lesson-row:hover{transform:translateX(2px);border-color:var(--accent);box-shadow:var(--shadow)}
.lesson-row .n{
  flex:none;width:30px;height:30px;border-radius:10px;background:var(--surface-2);color:var(--muted);
  display:grid;place-items:center;font-weight:700;font-size:13px;font-variant-numeric:tabular-nums;
}
.lesson-row .txt{flex:1;min-width:0}
.lesson-row .txt b{display:block;font-weight:600;font-size:16px}
.lesson-row .txt span{font-size:13.5px;color:var(--muted)}
.lesson-row .go{color:var(--accent);font-weight:700}
.lesson-crumb{font-size:13px;color:var(--muted);margin-bottom:6px}
.lesson-title{font-size:clamp(28px,3.6vw,42px)}
.lesson-goal{
  margin-top:14px;background:var(--teal-soft);border-radius:var(--radius);padding:16px 18px;
  display:flex;flex-direction:column;gap:5px;max-width:64ch;
}
.lesson-goal p{color:var(--ink);font-size:16px}
.task{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:18px 20px;margin-bottom:14px;
}
.task h3{font-size:16px;margin-bottom:12px}
.task-items{display:flex;flex-wrap:wrap;gap:10px}
.task-item{
  background:var(--surface-2);border-radius:11px;padding:12px 16px;
  font-size:19px;font-weight:600;font-variant-numeric:tabular-nums;letter-spacing:.02em;
}
.task-items.words{flex-direction:column;gap:12px}
.task-items.words .task-item{font-size:15.5px;font-weight:400;line-height:1.55;width:100%;letter-spacing:0}
.grades{display:grid;grid-template-columns:repeat(auto-fill,minmax(118px,1fr));gap:12px}
.grade{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:18px 16px;display:flex;flex-direction:column;gap:2px;align-items:flex-start;text-align:left;
  transition:transform .12s ease, border-color .15s ease, box-shadow .15s ease;
}
.grade:hover{transform:translateY(-2px);border-color:var(--accent);box-shadow:var(--shadow)}
.grade-n{font-family:"Bricolage Grotesque",sans-serif;font-size:32px;font-weight:800;line-height:1;color:var(--accent);font-variant-numeric:tabular-nums}
.grade-l{font-size:13px;color:var(--muted)}
.formats{display:flex;flex-direction:column;gap:14px}
.format{display:flex;gap:18px;align-items:flex-start;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:20px 22px}
.format-ic{flex:none;width:54px;height:54px;border-radius:16px;background:var(--accent-soft);display:grid;place-items:center;font-size:26px}
.format-body h3{font-size:20px;margin-bottom:6px}
.format-body p{color:var(--muted);font-size:15px;max-width:62ch}
@media (max-width:520px){.format{flex-direction:column;gap:12px}}
.welcome-strip{
  display:flex;align-items:center;gap:16px;background:var(--surface);border:1px solid var(--line);
  border-radius:var(--radius);padding:16px 18px;margin:26px 0 6px;box-shadow:var(--shadow);flex-wrap:wrap;
}
.mini-ava{width:46px;height:46px;border-radius:13px;display:grid;place-items:center;font-size:24px;flex:none;overflow:hidden;background:var(--surface-2)}
.mini-ava img{width:100%;height:100%;object-fit:cover}

.contacts{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:2px;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:var(--line)}
.contact{background:var(--surface);padding:18px 20px;display:flex;flex-direction:column;gap:4px}
.contact .k{font-size:12px;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}
.contact .v{font-weight:500;word-break:break-word;text-decoration:none}
a.contact-link:hover{text-decoration:underline}

/* ---------- profile ---------- */
.profile-grid{display:grid;grid-template-columns:minmax(280px,380px) 1fr;gap:26px;align-items:start;padding-top:34px}
.pcard{
  border:1px solid var(--line);border-radius:18px;overflow:hidden;background:var(--surface);box-shadow:var(--shadow);
}
.pcard-top{height:118px;position:relative}
.pcard-body{padding:0 20px 22px;text-align:center}
.ava{
  width:96px;height:96px;border-radius:26px;margin:-48px auto 12px;position:relative;
  display:grid;place-items:center;font-size:46px;overflow:hidden;
  background:var(--surface);border:4px solid var(--surface);
}
.ava img{width:100%;height:100%;object-fit:cover;border-radius:22px}
.ava.frame-glow{box-shadow:0 0 0 3px var(--accent), 0 0 26px -2px var(--accent)}
.ava.frame-ring{box-shadow:0 0 0 3px var(--teal)}
.ava.frame-dashed{outline:3px dashed var(--accent);outline-offset:3px}
.pname{font-family:"Bricolage Grotesque",sans-serif;font-size:24px;font-weight:700;letter-spacing:-.02em}
.puser{font-size:14px;color:var(--muted);margin-top:2px}
.field-hint{font-size:12px;color:var(--muted)}
.check{
  display:flex;gap:10px;align-items:flex-start;cursor:pointer;
  font-size:13px;color:var(--muted);margin:2px 0 15px;line-height:1.45;
}
.check input{width:18px;height:18px;flex:none;margin:1px 0 0;accent-color:var(--accent);cursor:pointer}
.static-field{
  background:var(--surface-2);border:1px solid var(--line);border-radius:10px;padding:11px 13px;
  color:var(--muted);font-weight:500;
}
.pbadge{margin-top:6px}
.pbio{color:var(--muted);margin-top:10px;font-size:15px;white-space:pre-wrap;word-break:break-word}
.pstats{display:grid;grid-template-columns:repeat(3,1fr);gap:2px;background:var(--line);border-top:1px solid var(--line);margin-top:20px}
.pstat{background:var(--surface);padding:12px 6px}
.pstat b{display:block;font-family:"Bricolage Grotesque",sans-serif;font-size:19px;font-variant-numeric:tabular-nums}
.pstat span{font-size:12px;color:var(--muted)}

.panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:20px;margin-bottom:16px}
.panel h3{font-size:17px;margin-bottom:4px}
.panel .sub{font-size:14px;color:var(--muted);margin-bottom:16px}
.ava-picker{display:flex;flex-wrap:wrap;gap:8px}
.ava-opt{
  width:46px;height:46px;border-radius:13px;border:1px solid var(--line);background:var(--bg);
  font-size:24px;display:grid;place-items:center;padding:0;
}
.ava-opt[aria-pressed="true"]{border-color:var(--accent);background:var(--accent-soft);box-shadow:0 0 0 2px var(--accent)}
.upload{display:flex;align-items:center;gap:10px;margin-top:14px;flex-wrap:wrap}
.upload input[type=file]{display:none}
.swatches{display:flex;flex-wrap:wrap;gap:10px}
.sw{width:64px;border:0;background:transparent;padding:0;display:flex;flex-direction:column;gap:5px;align-items:center}
.sw i{display:block;width:64px;height:40px;border-radius:11px;border:1px solid var(--line)}
.sw span{font-size:11px;color:var(--muted);line-height:1.2;text-align:center}
.sw[aria-pressed="true"] i{box-shadow:0 0 0 2px var(--accent);border-color:var(--accent)}
.sw[aria-pressed="true"] span{color:var(--ink);font-weight:600}
.pat-count{color:var(--accent);letter-spacing:0}
.patterns{
  display:grid;grid-template-columns:repeat(auto-fill,minmax(46px,1fr));gap:8px;
  max-height:240px;overflow-y:auto;padding:4px;
  border:1px solid var(--line);border-radius:12px;background:var(--bg);
  --pat-bg:linear-gradient(135deg,#A7C9B5,#6B9480);
}
.pat{
  aspect-ratio:1;border:1px solid var(--line);border-radius:10px;padding:0;cursor:pointer;
  background-image:var(--tile,none), var(--pat-bg);
  background-size:100% 100%, cover;
  background-repeat:no-repeat;
}
.pat:hover{border-color:var(--accent)}
.pat[aria-pressed="true"]{box-shadow:0 0 0 2px var(--accent);border-color:var(--accent)}
.pat-none{
  display:grid;place-items:center;font-size:11px;font-weight:700;color:var(--muted);
  background-image:none;background:var(--surface-2);
}
.edges{display:grid;grid-template-columns:repeat(auto-fill,minmax(76px,1fr));gap:10px}
.edge{
  height:56px;border:1px solid var(--line);border-radius:10px;padding:0;cursor:pointer;
  background:var(--surface);overflow:hidden;display:block;position:relative;
}
.edge:hover{border-color:var(--accent)}
.edge[aria-pressed="true"]{box-shadow:0 0 0 2px var(--accent);border-color:var(--accent)}
.edge-top{position:absolute;left:0;right:0;top:0;height:38px;display:block}
.edge-label{
  position:absolute;left:0;right:0;bottom:3px;font-size:10px;color:var(--muted);text-align:center;
}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{border:1px solid var(--line);background:var(--bg);border-radius:999px;padding:7px 13px;font-size:14px;font-weight:500}
.chip[aria-pressed="true"]{border-color:var(--accent);background:var(--accent-soft);color:var(--accent);font-weight:600}
.counter{font-size:12px;color:var(--muted);text-align:right}
.actions{display:flex;gap:10px;flex-wrap:wrap}
.saved{font-size:14px;color:var(--teal);align-self:center;opacity:0;transition:opacity .2s}
.saved.on{opacity:1}

/* ---------- bottom nav ---------- */
.bottomnav{
  position:fixed;left:0;right:0;bottom:0;z-index:40;
  background:color-mix(in srgb, var(--surface) 92%, transparent);
  backdrop-filter:blur(12px);
  border-top:1px solid var(--line);
  display:none;
}
body.logged .bottomnav{display:block}
body.logged{padding-bottom:82px}
.bottomnav-in{max-width:var(--maxw);margin:0 auto;padding:9px 22px;display:flex;gap:8px}
.nav-btn{
  flex:1;border:0;background:transparent;border-radius:12px;padding:8px 4px;
  display:flex;flex-direction:column;align-items:center;gap:3px;font-size:12px;font-weight:600;color:var(--muted);
}
.nav-btn .ic{font-size:19px;line-height:1}
.nav-btn[aria-current="page"]{background:var(--accent-soft);color:var(--accent)}

.footer{padding:26px 0 34px;color:var(--muted);font-size:13px;border-top:1px solid var(--line);margin-top:30px}

.view{display:none}
.view.on{display:block}

@media (max-width:860px){
  .profile-grid{grid-template-columns:1fr}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}
/* ---- interactive lesson ---- */
.lesson-best{margin-top:12px;font-size:14px;color:var(--teal);font-weight:600}
.lecture-card{
  margin-top:22px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:24px 22px;box-shadow:var(--shadow);max-width:64ch;
}
.lecture-card p{font-size:16px;line-height:1.6;color:var(--ink);margin:10px 0 20px}
.quiz-head{display:flex;align-items:center;gap:14px;margin:26px 0 14px}
.quiz-bar{flex:1;height:8px;border-radius:99px;background:var(--surface-2);overflow:hidden}
.quiz-bar i{display:block;height:100%;background:var(--accent);border-radius:99px;transition:width .25s ease}
.quiz-count{font-size:13px;color:var(--muted);font-variant-numeric:tabular-nums;white-space:nowrap}
.quiz-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:26px 24px;box-shadow:var(--shadow);
}
.quiz-instr{font-size:14px;color:var(--muted);text-align:center;margin-top:14px}
.quiz-help{
  background:var(--teal-soft);border-radius:var(--radius);padding:14px 16px;
  text-align:center;margin-bottom:4px;
}
.quiz-help-label{
  font-size:11px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;
  color:var(--teal);display:block;margin-bottom:8px;
}
.quiz-help-ex{
  font-family:"Bricolage Grotesque",sans-serif;font-weight:700;color:var(--ink);
  font-size:clamp(18px,2.6vw,24px);margin:0 0 6px;line-height:1.3;
}
.quiz-help-how{font-size:13.5px;color:var(--muted);margin:0;line-height:1.4}
.quiz-prompt{
  font-family:"Bricolage Grotesque",sans-serif;font-weight:700;letter-spacing:.01em;
  font-size:clamp(34px,5vw,52px);text-align:center;margin:14px 0 24px;
  font-variant-numeric:tabular-nums;
}
.quiz-prompt.big{font-size:clamp(40px,6vw,62px);letter-spacing:.06em}
.quiz-prompt.word{
  font-family:"Public Sans",sans-serif;font-weight:400;font-size:clamp(17px,2.2vw,21px);
  line-height:1.5;letter-spacing:0;max-width:52ch;margin-left:auto;margin-right:auto;
}
.quiz-options{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:12px;max-width:520px;margin:0 auto}
.quiz-opt{
  border:2px solid var(--line);background:var(--bg);border-radius:14px;padding:18px 10px;
  font-family:"Bricolage Grotesque",sans-serif;font-size:26px;font-weight:700;
  font-variant-numeric:tabular-nums;cursor:pointer;
  transition:transform .1s ease,border-color .15s ease,background .15s ease;
}
.quiz-opt:hover:not(:disabled){border-color:var(--accent);transform:translateY(-2px)}
.quiz-opt:disabled{cursor:default}
.quiz-opt.right{border-color:var(--teal);background:var(--teal-soft);color:var(--teal)}
.quiz-opt.wrong{border-color:var(--danger);background:var(--accent-soft);color:var(--danger)}
.quiz-feedback{min-height:22px;margin-top:16px;text-align:center;font-size:15px;font-weight:600}
.quiz-feedback.ok{color:var(--teal)}
.quiz-feedback.no{color:var(--danger)}
.result-card{
  background:var(--surface);border:1px solid var(--line);border-radius:18px;
  padding:34px 26px;text-align:center;box-shadow:var(--shadow);margin-top:26px;
}
.result-emoji{font-size:56px;line-height:1}
.result-stars{margin:10px 0 6px;font-size:30px;letter-spacing:6px}
.res-star{color:var(--line)}
.res-star.on{color:var(--accent)}
.result-card h2{font-size:28px}
.result-score{
  font-family:"Bricolage Grotesque",sans-serif;font-size:22px;font-weight:700;
  margin-top:8px;font-variant-numeric:tabular-nums;
}
.result-note{color:var(--muted);margin-top:8px;font-size:15px}
.result-actions{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-top:22px}
.lesson-row .go.scored{
  background:var(--teal-soft);color:var(--teal);border-radius:99px;padding:4px 10px;
  font-size:13px;font-variant-numeric:tabular-nums;
}

/* ============ lecture steps, progress lines, task kinds ============ */
#view-lesson [hidden],#view-section [hidden]{display:none!important}

/* lecture */
.lec-top{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.lec-count{font-size:13px;color:var(--muted);font-variant-numeric:tabular-nums}
.lec-skip{margin-left:auto;border:0;background:none;color:var(--muted);font:inherit;font-size:13px;cursor:pointer;text-decoration:underline;text-underline-offset:3px}
.lec-skip:hover{color:var(--accent)}
.lec-line{display:flex;align-items:center;margin:16px 0 6px}
.lec-node{
  flex:none;width:30px;height:30px;border-radius:50%;border:2px solid var(--line);background:var(--surface);
  color:var(--muted);font:inherit;font-size:13px;font-weight:700;cursor:pointer;display:grid;place-items:center;
  transition:background .2s ease,border-color .2s ease,transform .15s ease;
}
.lec-node.on{border-color:var(--accent);color:var(--accent);transform:scale(1.12)}
.lec-node.done{background:var(--teal);border-color:var(--teal);color:var(--surface)}
.lec-seg{flex:1;height:3px;background:var(--line);border-radius:3px;margin:0 3px;transition:background .3s ease}
.lec-seg.done{background:var(--teal)}
.lec-body{min-height:220px;padding:14px 0 4px;animation:lecIn .3s ease}
@keyframes lecIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.lec-h{font-size:22px;margin:4px 0 10px}
.lec-lead{font-size:16.5px;line-height:1.6;margin:0 0 12px}
.lec-point{display:flex;gap:10px;align-items:baseline;font-size:15.5px;line-height:1.55;margin:0 0 8px;
  background:var(--surface-2);border-radius:10px;padding:10px 14px}
.lec-dot{color:var(--accent);flex:none}
.lec-tag{display:block;margin:6px 0 8px}
.lec-rule{font-size:17px;line-height:1.55;margin:0 0 12px;font-weight:600}
.lec-ex{background:var(--teal-soft);border-radius:12px;padding:12px 16px;margin-bottom:18px;
  font-family:"Bricolage Grotesque",sans-serif;font-weight:700;font-size:clamp(17px,2.4vw,22px)}
.lec-demo{background:var(--bg);border:1px dashed var(--line);border-radius:14px;padding:18px;text-align:center;min-height:90px}
.lec-demo-q{font-family:"Bricolage Grotesque",sans-serif;font-weight:700;font-size:clamp(26px,4vw,38px);font-variant-numeric:tabular-nums}
.lec-demo-q.word{font-family:"Public Sans",sans-serif;font-weight:400;font-size:17px;line-height:1.5}
.lec-demo-a{margin-top:10px;font-size:24px;font-weight:700;transition:opacity .4s ease,transform .4s ease}
.lec-demo-a.later{opacity:0;transform:translateY(6px)}
.lec-ans{background:var(--teal-soft);color:var(--teal);border-radius:8px;padding:0 8px}
.lec-again{margin-top:12px;font-size:14px;padding:8px 14px}
.lec-try-instr{color:var(--muted);text-align:center;margin:0 0 6px;font-size:14px}
.lec-opts{margin-top:16px}
.lec-nav{display:flex;gap:10px;justify-content:flex-end;margin-top:18px;flex-wrap:wrap}
.lec-nav #lec-prev{margin-right:auto}
.kind-chips{display:flex;flex-wrap:wrap;gap:8px}
.kind-chip{display:inline-flex;align-items:center;gap:7px;background:var(--surface-2);border:1px solid var(--line);
  border-radius:99px;padding:7px 13px;font-size:14px;font-weight:600}
.kind-chip i{font-style:normal;color:var(--muted);font-weight:500;font-variant-numeric:tabular-nums}

/* quiz progress line */
.quiz-head{gap:10px;margin:26px 0 8px}
.quiz-count{margin-right:auto}
.quiz-score{font-size:13px;font-weight:700;color:var(--teal);font-variant-numeric:tabular-nums}
.quiz-streak{font-size:13px;font-weight:700;color:var(--accent);animation:pop .35s ease}
.quiz-track{position:relative;display:flex;gap:2px;height:10px;margin:22px 30px 18px 0}
.quiz-track > i{flex:1;background:var(--surface-2);border-radius:3px;transition:background .25s ease}
.quiz-track > i.ok{background:var(--teal)}
.quiz-track > i.no{background:var(--danger)}
.quiz-track > i.now{background:var(--accent);opacity:.55}
.track-runner{position:absolute;bottom:8px;font-size:22px;line-height:1;transform:translateX(-30%);transition:left .4s ease;pointer-events:none}
.track-goal{position:absolute;right:-28px;top:50%;transform:translateY(-50%);font-size:20px}
.quiz-kind{display:table;margin:0 auto;background:var(--accent-soft);color:var(--accent);border-radius:99px;
  padding:4px 12px;font-size:12.5px;font-weight:700}
.quiz-instr{margin-top:8px}
.quiz-actions{display:flex;justify-content:center;gap:10px;margin-top:12px}
.quiz-actions:empty{display:none}
@keyframes pop{0%{transform:scale(.6)}60%{transform:scale(1.15)}100%{transform:scale(1)}}
@keyframes shake{0%,100%{transform:none}25%{transform:translateX(-6px)}75%{transform:translateX(6px)}}

/* blanks in a prompt */
.slot{display:inline-block;min-width:1.6em;padding:0 .25em;margin:0 .1em;border-radius:12px;
  border:3px dashed var(--line);background:var(--bg);color:var(--accent);text-align:center;line-height:1.25;
  vertical-align:middle;transition:border-color .15s ease,background .15s ease}
.slot.typing{border-style:solid;border-color:var(--accent)}
.slot.empty::after{content:"";display:inline-block;width:2px;height:.8em;background:var(--accent);vertical-align:-.05em;animation:blink 1s steps(1) infinite}
@keyframes blink{50%{opacity:0}}
.slot.drop.wants,.slot.drop.dnd-over{border-color:var(--accent);background:var(--accent-soft)}
.slot.right{border-style:solid;border-color:var(--teal);background:var(--teal-soft);color:var(--teal);animation:pop .3s ease}
.slot.wrong{border-style:solid;border-color:var(--danger);background:var(--accent-soft);color:var(--danger);animation:shake .3s ease}
.slot.filled{border-style:solid}
.demo-slot.pop{animation:pop .35s ease}
.answer-row{display:flex;align-items:center;justify-content:center;gap:12px;margin:-8px 0 18px;
  font-family:"Bricolage Grotesque",sans-serif;font-weight:700;font-size:30px}
.answer-lbl{font-family:"Public Sans",sans-serif;font-size:14px;font-weight:600;color:var(--muted)}

/* keypad */
.keypad{display:grid;grid-template-columns:repeat(auto-fill,minmax(58px,1fr));gap:8px;max-width:360px;margin:0 auto}
.key{border:2px solid var(--line);background:var(--bg);border-radius:12px;padding:12px 0;cursor:pointer;
  font-family:"Bricolage Grotesque",sans-serif;font-size:22px;font-weight:700;color:var(--ink);transition:transform .08s ease,border-color .15s ease}
.key:hover:not(:disabled){border-color:var(--accent)}
.key:active{transform:scale(.94)}
.key-del{color:var(--muted)}
.key:disabled{opacity:.5;cursor:default}

/* draggable number cards */
.dnd{touch-action:none;user-select:none;-webkit-user-select:none;cursor:grab}
.dnd.locked{cursor:default}
.dnd-src{opacity:.35}
.dnd-ghost{position:fixed;left:0;top:0;z-index:999;pointer-events:none;box-shadow:0 14px 30px -10px rgba(0,0,0,.45);opacity:.95}
.tray-hint{text-align:center;font-size:12.5px;color:var(--muted);margin:0 0 10px}
.card-tray{display:flex;flex-wrap:wrap;justify-content:center;gap:10px;min-height:64px;padding:8px;border-radius:14px}
.ncard{
  display:inline-grid;place-items:center;min-width:64px;padding:14px 16px;border-radius:14px;
  background:var(--surface);border:2px solid var(--line);border-bottom-width:5px;
  font-family:"Bricolage Grotesque",sans-serif;font-size:24px;font-weight:700;font-variant-numeric:tabular-nums;
  transition:transform .12s ease,border-color .15s ease,opacity .15s ease;
}
.ncard:hover:not(.locked){transform:translateY(-3px) rotate(-1deg);border-color:var(--accent)}
.ncard.small{font-size:18px;padding:10px 12px;min-width:0}
.ncard.picked{border-color:var(--accent);background:var(--accent-soft);transform:translateY(-3px)}
.ncard.used{opacity:.3}
.ncard.dnd-over{border-color:var(--accent);background:var(--accent-soft)}
.ncard.right{border-color:var(--teal);background:var(--teal-soft);color:var(--teal)}
.ncard.wrong{border-color:var(--danger);background:var(--accent-soft);color:var(--danger)}

/* true / false + find the mistake */
.tf-row{display:grid;grid-template-columns:1fr 1fr;gap:12px;max-width:420px;margin:0 auto}
.quiz-opt.tf{font-size:20px}
.odd-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:12px;max-width:560px;margin:0 auto}
.quiz-opt.odd{font-size:22px}

/* match pairs */
.match-grid{display:grid;grid-template-columns:1fr auto 1fr;gap:12px;align-items:center;max-width:540px;margin:0 auto}
.match-col{display:flex;flex-direction:column;gap:10px}
.match-mid{color:var(--muted);font-size:22px}
.mcard{padding:12px 10px;border-radius:12px;border:2px solid var(--line);background:var(--bg);text-align:center;
  font-family:"Bricolage Grotesque",sans-serif;font-size:20px;font-weight:700;font-variant-numeric:tabular-nums;
  cursor:pointer;transition:border-color .15s ease,background .15s ease}
.mcard:hover:not(.done){border-color:var(--accent)}
.mcard.picked,.mcard.dnd-over{border-color:var(--accent);background:var(--accent-soft)}
.mcard.shake{animation:shake .3s ease;border-color:var(--danger)}
.mcard.done{cursor:default;animation:pop .3s ease}
.mcard.m1{--h:#5E8F67}
.mcard.m2{--h:#5A7FA8}
.mcard.m3{--h:#B7894A}
.mcard.m4{--h:#9A5E92}
.mcard.done{background:color-mix(in srgb,var(--h) 24%,var(--surface));border-color:var(--h);color:var(--ink)}

/* sort cards */
.order-wrap{max-width:560px;margin:0 auto}
.order-ends{display:flex;justify-content:space-between;font-size:12.5px;color:var(--muted);font-weight:600;margin-bottom:6px}
.order-ends span:first-child::before{content:"◀ "}
.order-ends span:last-child::after{content:" ▶"}
.order-row{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;padding:12px;border-radius:14px;
  background:linear-gradient(90deg,var(--surface-2),var(--accent-soft))}
.order-card{font-size:20px;padding:14px 6px;min-width:0}

/* baskets */
.bucket-pool{background:var(--surface-2);margin-bottom:14px;max-width:560px;margin-left:auto;margin-right:auto}
.baskets{display:grid;grid-template-columns:1fr 1fr;gap:12px;max-width:560px;margin:0 auto}
.basket{border:3px dashed var(--line);border-radius:18px;padding:10px;min-height:130px;cursor:pointer;
  display:flex;flex-direction:column;gap:8px;transition:border-color .15s ease,background .15s ease}
.basket.yes{border-color:color-mix(in srgb,var(--teal) 55%,var(--line))}
.basket.no{border-color:color-mix(in srgb,var(--danger) 55%,var(--line))}
.basket.dnd-over{background:var(--surface-2);border-style:solid}
.basket-lbl{text-align:center;font-weight:700;font-size:14px}
.basket.yes .basket-lbl{color:var(--teal)}
.basket.no .basket-lbl{color:var(--danger)}
.basket-list{display:flex;flex-wrap:wrap;gap:6px;justify-content:center}

/* number line */
.nline{max-width:560px;margin:30px auto 14px;padding:0 18px}
.nline-track{position:relative;height:6px;background:var(--line);border-radius:6px;margin:44px 0 34px}
.nline-tick{position:absolute;top:-7px;width:20px;height:20px;margin-left:-10px;border:0;background:none;cursor:pointer;padding:0}
.nline-tick::before{content:"";position:absolute;left:9px;top:3px;width:2px;height:14px;background:var(--muted);border-radius:2px}
.nline-tick.major::before{height:20px;top:0;width:3px;left:8.5px;background:var(--ink)}
.nline-tick span{position:absolute;top:24px;left:50%;transform:translateX(-50%);font-size:12px;color:var(--muted);font-variant-numeric:tabular-nums;white-space:nowrap}
.nline-tick.major span{font-weight:700;color:var(--ink);font-size:13px}
@media (max-width:520px){.nline-tick:not(.major) span{display:none}}
.nline-pin{position:absolute;bottom:4px;font-size:32px;line-height:1;transform:translateX(-50%);cursor:grab;touch-action:none;
  user-select:none;transition:left .15s ease;z-index:2}
.nline-pin.grab{cursor:grabbing;transition:none}
.nline-val{position:absolute;bottom:100%;left:50%;transform:translateX(-50%);background:var(--accent);color:var(--accent-ink);
  border-radius:8px;padding:1px 7px;font-size:13px;font-weight:700;font-variant-numeric:tabular-nums}
.nline-pin.right .nline-val{background:var(--teal)}
.nline-pin.wrong .nline-val{background:var(--danger)}
.nline-flag{position:absolute;top:-34px;transform:translateX(-50%);font-size:24px;animation:pop .35s ease}

/* result: by task kind */
.res-kinds-wrap{max-width:420px;margin:20px auto 0;text-align:left}
.res-kinds{display:flex;flex-direction:column;gap:6px;margin-top:8px}
.res-kind{display:grid;grid-template-columns:24px 1fr 90px 44px;align-items:center;gap:8px;font-size:14px}
.rk-bar{height:7px;background:var(--surface-2);border-radius:7px;overflow:hidden}
.rk-bar i{display:block;height:100%;background:var(--teal);border-radius:7px}
.rk-n{text-align:right;color:var(--muted);font-variant-numeric:tabular-nums}

/* section progress path */
.sp-progress{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px;margin:16px 0 18px}
.sp-head{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;font-size:14px;font-weight:600}
.sp-stars{color:var(--accent)}
.sp-bar{height:6px;background:var(--surface-2);border-radius:6px;margin:10px 0 16px;overflow:hidden}
.sp-bar i{display:block;height:100%;background:var(--teal);border-radius:6px;transition:width .4s ease}
.sp-path{display:flex;align-items:flex-start}
.sp-node{flex:none;display:flex;flex-direction:column;align-items:center;gap:3px;border:0;background:none;padding:0;cursor:pointer;font:inherit;color:inherit}
.sp-num{width:32px;height:32px;border-radius:50%;display:grid;place-items:center;border:2px solid var(--line);background:var(--bg);
  font-size:13px;font-weight:700;color:var(--muted);transition:transform .12s ease}
.sp-node:hover .sp-num{transform:scale(1.1);border-color:var(--accent)}
.sp-node.done .sp-num{background:var(--teal);border-color:var(--teal);color:var(--surface)}
.sp-node.next .sp-num{border-color:var(--accent);background:var(--accent-soft);font-size:17px;animation:pop .5s ease}
.sp-st{font-size:9px;letter-spacing:-1px;color:var(--accent);min-height:11px}
.sp-seg{flex:1;height:3px;background:var(--line);border-radius:3px;margin:15px 2px 0;min-width:4px}
.sp-seg.done{background:var(--teal)}
@media (max-width:520px){.sp-num{width:26px;height:26px;font-size:11px}.sp-seg{margin-top:12px}}

/* section cards in a grade: lessons done */
.folder-prog{display:flex;align-items:center;gap:8px;width:100%;margin-top:6px}
.fp-track{flex:1;height:5px;border-radius:5px;background:var(--surface-2);overflow:hidden}
.fp-track i{display:block;height:100%;background:var(--teal);border-radius:5px}
.folder-prog b{font-size:12px;color:var(--muted);font-weight:600;font-variant-numeric:tabular-nums}

/* connect with lines */
.lines-wrap{position:relative;display:grid;grid-template-columns:1fr 1fr;gap:clamp(40px,12vw,110px);max-width:560px;margin:0 auto}
.lines-col{display:flex;flex-direction:column;gap:12px}
.lines-svg{position:absolute;inset:0;width:100%;height:100%;pointer-events:none;overflow:visible;color:var(--accent)}
.lcard{position:relative;display:flex;align-items:center;justify-content:center;padding:12px 10px;border-radius:12px;
  border:2px solid var(--line);background:var(--bg);font-family:"Bricolage Grotesque",sans-serif;font-size:20px;font-weight:700;
  font-variant-numeric:tabular-nums;cursor:pointer;touch-action:none;user-select:none;transition:border-color .15s ease,background .15s ease}
.lcard:hover:not(.done){border-color:var(--accent)}
.lcard.picked{border-color:var(--accent);background:var(--accent-soft)}
.lcard.shake{animation:shake .3s ease;border-color:var(--danger)}
.lcard.done{border-color:var(--h);background:color-mix(in srgb,var(--h) 20%,var(--surface));cursor:default}
.ldot{position:absolute;right:-9px;top:50%;width:14px;height:14px;margin-top:-7px;border-radius:50%;
  background:var(--surface);border:3px solid var(--accent)}
.lines-col.right .ldot{right:auto;left:-9px}
.lcard.done .ldot{background:var(--h);border-color:var(--h)}

/* connect the dots */
.dots-box{position:relative;max-width:460px;margin:6px auto 0;aspect-ratio:4/3;border-radius:18px;
  background:radial-gradient(circle at 1px 1px,var(--line) 1px,transparent 1.5px) 0 0/18px 18px,var(--bg);border:1px solid var(--line)}
.dots-svg{position:absolute;inset:6%;width:88%;height:88%;overflow:visible}
.dots-box .dot{position:absolute;transform:translate(-50%,-50%);margin:0;min-width:42px;height:42px;padding:0 8px;border-radius:99px;
  border:2px solid var(--accent);background:var(--surface);color:var(--ink);cursor:pointer;
  font-family:"Bricolage Grotesque",sans-serif;font-size:16px;font-weight:700;font-variant-numeric:tabular-nums;white-space:nowrap;
  transition:background .15s ease,transform .15s ease;z-index:2}
.dots-box .dot:hover:not(.on){transform:translate(-50%,-50%) scale(1.08)}
.dots-box .dot.on{background:var(--teal);border-color:var(--teal);color:var(--surface)}
.dots-box .dot.shake{animation:shakeDot .3s ease;border-color:var(--danger)}
@keyframes shakeDot{0%,100%{transform:translate(-50%,-50%)}25%{transform:translate(calc(-50% - 6px),-50%)}75%{transform:translate(calc(-50% + 6px),-50%)}}
.dots-path{fill:none;stroke:var(--teal);stroke-linejoin:round;stroke-linecap:round;vector-effect:non-scaling-stroke}
.dots-path{stroke-width:4}
.dots-fill{fill:var(--teal);opacity:0;transition:opacity .6s ease}
.dots-box.complete .dots-fill{opacity:.18}
.dots-reveal{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%) scale(0);font-size:56px;transition:transform .5s cubic-bezier(.3,1.6,.5,1) .2s;pointer-events:none;z-index:1}
.dots-box.complete .dots-reveal{transform:translate(-50%,-50%) scale(1)}

/* leaves */
.tree-scene{position:relative;max-width:480px;height:340px;margin:0 auto}
.tree-trunk{position:absolute;left:50%;bottom:20px;width:46px;height:120px;margin-left:-23px;border-radius:10px 10px 4px 4px;
  background:linear-gradient(90deg,#7A5537,#9A6E48 50%,#7A5537)}
.tree-crown{position:absolute;left:0;right:0;top:0;height:250px;border-radius:50% 50% 46% 46%/58% 58% 42% 42%;
  background:radial-gradient(circle at 35% 30%,color-mix(in srgb,var(--teal) 30%,var(--surface)),color-mix(in srgb,var(--teal) 18%,var(--surface)) 70%)}
.leaf{position:absolute;transform:translate(-50%,-50%) rotate(var(--r));min-width:108px;padding:14px 16px;border:0;cursor:pointer;
  border-radius:4px 60% 4px 60%;background:linear-gradient(135deg,#7FB069,#4F8A3C);color:#fff;
  font-family:"Bricolage Grotesque",sans-serif;font-size:17px;font-weight:700;font-variant-numeric:tabular-nums;white-space:nowrap;
  box-shadow:0 6px 14px -8px rgba(0,0,0,.5);transition:transform .2s ease,background .2s ease;z-index:2}
.leaf:hover{transform:translate(-50%,-50%) rotate(var(--r)) scale(1.06)}
.leaf.picked{background:linear-gradient(135deg,#F2B544,#D9822B);transform:translate(-50%,-50%) rotate(0) scale(1.08)}
.leaf.fall{animation:leafFall 1s ease forwards}
.leaf.wrong{background:linear-gradient(135deg,#D9737E,#9E3A44)}
.leaf.missed{outline:3px dashed #F2B544;outline-offset:3px}
.leaf.stay{opacity:.75}
@keyframes leafFall{to{top:92%;left:50%;transform:translate(-50%,-50%) rotate(200deg) scale(.5);opacity:.85}}
.tree-basket{position:absolute;left:50%;bottom:-6px;transform:translateX(-50%);font-size:44px;line-height:1;z-index:3;text-align:center}
.tree-count{display:block;font-size:12px;font-weight:700;color:var(--muted);white-space:nowrap}

/* rule with a gap */
.quiz-prompt.rule-text{background:var(--teal-soft);border-radius:14px;padding:18px 20px;text-align:left;line-height:2}
.rule-badge{display:block;font-size:11px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--teal);line-height:1.4;margin-bottom:6px}
.slot.word-slot{min-width:5em;font-family:"Bricolage Grotesque",sans-serif;font-weight:700;line-height:1.5}
.ncard.word-card{font-size:18px;padding:10px 14px}

/* number pyramid */
.pyramid{display:flex;flex-direction:column;align-items:center;gap:6px;margin:0 auto 18px}
.pyr-row{display:flex;gap:6px}
.brick{width:84px;height:52px;display:grid;place-items:center;border-radius:8px;
  background:color-mix(in srgb,var(--accent) 16%,var(--surface));border:2px solid color-mix(in srgb,var(--accent) 40%,var(--line));
  font-family:"Bricolage Grotesque",sans-serif;font-size:22px;font-weight:700;font-variant-numeric:tabular-nums;color:var(--ink)}
.brick.blank{background:var(--bg);border-style:dashed;cursor:pointer;font:inherit;font-family:"Bricolage Grotesque",sans-serif;font-size:22px;font-weight:700}
.brick.active{border-style:solid;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.brick.right{border-color:var(--teal);background:var(--teal-soft);color:var(--teal)}
.brick.wrong{border-color:var(--danger);background:var(--accent-soft);color:var(--danger);font-size:15px}

/* rules page of a section */
.rules-btn{margin:0 0 14px}
.rules-box{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:20px;margin-bottom:18px;animation:lecIn .3s ease}
.rules-h{font-size:24px;margin:0 0 6px}
.rules-lead{color:var(--muted);margin:0 0 12px}
.rules-intro{background:var(--surface-2);border-radius:10px;padding:12px 14px;margin:0 0 14px;line-height:1.55}
.rule-card{border:1px solid var(--line);border-left:5px solid var(--teal);border-radius:12px;padding:14px 16px;margin-top:12px;background:var(--bg)}
.rule-head{display:flex;align-items:center;gap:10px;margin-bottom:6px}
.rule-n{width:26px;height:26px;border-radius:50%;display:grid;place-items:center;background:var(--teal);color:var(--surface);font-size:13px;font-weight:700}
.rule-main{font-size:16.5px;font-weight:600;line-height:1.5;margin:0 0 10px}
.rule-sub{display:block;font-size:12px;color:var(--muted);font-weight:600;margin:4px 0 6px}
.rule-card .lec-ex{margin-bottom:10px}
.rule-solved{font-family:"Bricolage Grotesque",sans-serif;font-weight:700;font-size:22px;font-variant-numeric:tabular-nums}
.rule-solved.word{font-family:"Public Sans",sans-serif;font-weight:400;font-size:15px}

@media (max-width:520px){
  .leaf{min-width:84px;padding:10px 12px;font-size:14px}
  .brick{width:66px;height:46px;font-size:19px}
  .dots-box .dot{min-width:36px;height:36px;font-size:13px}
  .lcard{font-size:16px;padding:10px 6px}
}
@media (max-width:520px){
  .quiz-card{padding:20px 14px}
  .ncard{min-width:54px;padding:12px;font-size:21px}
  .order-row{grid-template-columns:repeat(2,1fr)}
  .match-grid{gap:8px}
  .mcard{font-size:17px;padding:10px 6px}
}


/* ============ maths grade 1: group tasks button + group page ============ */
.group-btn{
  display:flex;align-items:center;gap:16px;width:100%;margin-top:18px;text-align:left;
  padding:20px 22px;border-radius:var(--radius);border:1px solid var(--accent);cursor:pointer;
  background:var(--accent-soft);color:var(--ink);font:inherit;
  transition:transform .12s ease,box-shadow .15s ease;
}
.group-btn:hover{transform:translateY(-2px);box-shadow:var(--shadow)}
.group-ic{font-size:36px;line-height:1}
.group-txt{flex:1;min-width:0;display:flex;flex-direction:column;gap:2px}
.group-txt b{font-family:"Bricolage Grotesque",sans-serif;font-size:21px;font-weight:700;letter-spacing:-.02em}
.group-txt span{font-size:14px;color:var(--muted)}
.group-go{font-size:22px;font-weight:700;color:var(--accent)}

.group-grid{display:grid;grid-template-columns:minmax(0,380px) 1fr;gap:16px;align-items:start;margin-top:18px}
.group-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px}
.group-list li{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:10px 12px 10px 14px;border:1px solid var(--line);border-radius:10px;background:var(--bg);
}
.group-name{font-weight:600;min-width:0;overflow-wrap:anywhere}
.group-leave{padding:6px 12px;font-size:13px}
.group-empty{color:var(--muted);font-size:15px}
.group-empty[hidden]{display:none}
@media (max-width:860px){
  .group-grid{grid-template-columns:1fr}
}

/* language folders: a two-letter badge instead of an emoji (flags don't render on Windows) */
.folder-ic.lang-code{
  width:46px;height:46px;border-radius:13px;background:var(--accent-soft);color:var(--accent);
  display:grid;place-items:center;font-family:"Bricolage Grotesque",sans-serif;font-size:18px;font-weight:800;letter-spacing:.02em;
}

/* ============ username search in the top bar + other user's profile ============ */
.topsearch{position:relative;flex:1 1 240px;max-width:380px;display:flex;align-items:center}
.topsearch .ts-ic{position:absolute;left:13px;font-size:14px;line-height:1;pointer-events:none;opacity:.7}
.topsearch input{
  width:100%;padding:8px 14px 8px 36px;border:1px solid var(--line);border-radius:999px;background:var(--surface);
  font:inherit;font-size:14px;color:var(--ink);
}
.topsearch input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.search-pop{
  position:absolute;top:calc(100% + 8px);left:0;right:0;z-index:60;list-style:none;margin:0;padding:6px;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);
  max-height:min(60vh,420px);overflow:auto;
}
.search-pop[hidden]{display:none}
.search-item{
  display:flex;align-items:center;gap:12px;width:100%;text-align:left;padding:8px 10px;border:0;border-radius:10px;
  background:transparent;color:var(--ink);font:inherit;cursor:pointer;
}
.search-item:hover,.search-item:focus-visible{background:var(--surface-2);outline:none}
.si-ava{width:34px;height:34px;border-radius:50%;background:var(--surface-2);display:grid;place-items:center;font-size:18px;flex:none}
.si-txt{display:flex;flex-direction:column;min-width:0}
.si-txt b{font-weight:600;font-size:15px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.si-txt span{font-size:13px;color:var(--muted)}
.search-none{padding:12px;color:var(--muted);font-size:14px}
.user-card{max-width:420px;margin:34px auto 0}
.user-card[hidden]{display:none}
.user-card .pstats{grid-template-columns:1fr}
@media (max-width:640px){
  .topsearch{order:3;flex:1 1 100%;max-width:none}
}